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Issue #13874: read_null() of faulthandler uses volatile to avoid optimisation

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Clang 3.0 removes "y = *x;" instruction if the optimisation level is 3.
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Victor Stinner 2012-01-30 00:07:43 +01:00
parent 7ab4af0427
commit a2477208c8
1 changed files with 4 additions and 1 deletions
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5
Modules/faulthandler.c
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@ -943,10 +943,13 @@ faulthandler_unregister_py(PyObject *self, PyObject *args)
static PyObject * static PyObject *
faulthandler_read_null(PyObject *self, PyObject *args) faulthandler_read_null(PyObject *self, PyObject *args)
{ {
int *x = NULL, y; volatile int *x;
volatile int y;
int release_gil = 0; int release_gil = 0;
if (!PyArg_ParseTuple(args, "|i:_read_null", &release_gil)) if (!PyArg_ParseTuple(args, "|i:_read_null", &release_gil))
return NULL; return NULL;
x = NULL;
if (release_gil) { if (release_gil) {
Py_BEGIN_ALLOW_THREADS Py_BEGIN_ALLOW_THREADS
y = *x; y = *x;